<template>
    <div>
         <!-- 面包屑 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>数据统计</el-breadcrumb-item>
        <el-breadcrumb-item>数据报表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 主题内容 -->
        <el-card class="eChart">
            <!-- 1.为 ECharts 准备一个具备大小（宽高）的 DOM -->
            <div id="main" style="width: 750px;height:500px;"></div>
        </el-card>
    </div>
</template>

<script>
    // 2.引入 echarts 
    import * as echarts from 'echarts'
    import _ from 'lodash'
    export default {
        name : 'Report',
        data() {
            return {
                options: {
                    title: {
                    text: '用户来源'
                    },
                    tooltip: {
                    trigger: 'axis',
                    axisPointer: {
                        type: 'cross',
                        label: {
                        backgroundColor: '#E9EEF3'
                        }
                    }
                    },
                    grid: {
                    left: '3%',
                    right: '4%',
                    bottom: '3%',
                    containLabel: true
                    },
                    xAxis: [
                    {
                        boundaryGap: false
                    }
                    ],
                    yAxis: [
                    {
                        type: 'value'
                    }
                    ]
                }
            }
        },
        created(){

        },
        async mounted(){
            // 3.基于准备好的dom，初始化echarts实例
            var myChart = echarts.init(document.getElementById('main'));
            
            const {data: res} = await this.$http.get('reports/type/1')
            if(res.meta.status != 200) return this.$message.error(res.meta.msg)
            // 4.指定图表的配置项和数据 (由后端返回)
            // 将两个option合并
            const result = _.merge(res.data,this.options)

            // 5.使用刚指定的配置项和数据显示图表。
            myChart.setOption(result);
        }
    }
</script>

<style scoped>
.eChart{
    margin-top: 20px;
}
</style>